diff options
| -rw-r--r-- | sw/z80/crt0.s | 125 | ||||
| -rw-r--r-- | sw/z80/kernel/include/types.h | 2 | ||||
| -rw-r--r-- | sw/z80/libc/mem.c | 7 | ||||
| -rw-r--r-- | sw/z80/makefile | 20 |
4 files changed, 122 insertions, 32 deletions
diff --git a/sw/z80/crt0.s b/sw/z80/crt0.s index d0ae3ca..7701ca6 100644 --- a/sw/z80/crt0.s +++ b/sw/z80/crt0.s @@ -1,30 +1,103 @@ - .area _HEADER (ABS) - ;; reset vector - .org 0 - jp init - - .org 0x08 - reti - .org 0x10 - reti - .org 0x18 - reti - .org 0x20 - reti - .org 0x28 - reti - .org 0x30 - reti - .org 0x38 - reti - - .org 0x100 +;-------------------------------------------------------------------------- +; crt0.s - Generic crt0.s for a Z80 +; +; Copyright (C) 2000, Michael Hope +; +; This library is free software; you can redistribute it and/or modify it +; under the terms of the GNU General Public License as published by the +; Free Software Foundation; either version 2, or (at your option) any +; later version. +; +; This library is distributed in the hope that it will be useful, +; but WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +; GNU General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this library; see the file COPYING. If not, write to the +; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston, +; MA 02110-1301, USA. +; +; As a special exception, if you link this library with other files, +; some of which are compiled with SDCC, to produce an executable, +; this library does not by itself cause the resulting executable to +; be covered by the GNU General Public License. This exception does +; not however invalidate any other reasons why the executable file +; might be covered by the GNU General Public License. +;-------------------------------------------------------------------------- + .module crt0 + .globl _main + + .area _HEADER (ABS) + ;; Reset vector + .org 0 + jp init + + .org 0x08 + reti + .org 0x10 + reti + .org 0x18 + reti + .org 0x20 + reti + .org 0x28 + reti + .org 0x30 + reti + .org 0x38 + reti + + .org 0x100 init: - ;; set stack - ld sp,#0xFFFF + ;; Set stack pointer directly above top of memory. + ld sp,#0xFFFF + + ;; Initialise global variables + call gsinit + call _main + jp _exit + + ;; Ordering of segments for the linker. + .area _HOME + .area _CODE + .area _INITIALIZER + .area _GSINIT + .area _GSFINAL + + .area _DATA + .area _INITIALIZED + .area _BSEG + .area _BSS + .area _HEAP + + .area _CODE + +__clock:: + ld a,#2 + rst 0x08 + ret + +_exit:: + ;; Exit - special code to the emulator + ld a,#0 + rst 0x08 +1$: + halt + jr 1$ + + .area _GSINIT +gsinit:: + ; ld bc, #l__INITIALIZER + ld a, b + or a, c + jr Z, gsinit_next + ; ld de, #s__INITIALIZED + ; ld hl, #s__INITIALIZER + ldir +gsinit_next: - ;; call C main function - call _main + .area _GSFINAL + ret -.globl _main diff --git a/sw/z80/kernel/include/types.h b/sw/z80/kernel/include/types.h index adde214..c24b311 100644 --- a/sw/z80/kernel/include/types.h +++ b/sw/z80/kernel/include/types.h @@ -6,4 +6,6 @@ #define int16_t int #define uint16_t unsigned int +#define size_t uint16_t + #endif diff --git a/sw/z80/libc/mem.c b/sw/z80/libc/mem.c new file mode 100644 index 0000000..667a752 --- /dev/null +++ b/sw/z80/libc/mem.c @@ -0,0 +1,7 @@ +#include "types.h" +#include "mem.h" + +void *malloc(size_t size) +{ + : +} diff --git a/sw/z80/makefile b/sw/z80/makefile index ecdd9a4..3d682ca 100644 --- a/sw/z80/makefile +++ b/sw/z80/makefile @@ -4,6 +4,7 @@ OSNAME := helvetiOS CSOURCES := $(wildcard kernel/*.c) $(wildcard libc/*.c) +OBJECTS := $(patsubst %.c,build/%.rel,$(CSOURCES)) HEXFILE := build/$(OSNAME).hex BINARY := build/$(OSNAME).bin @@ -12,26 +13,33 @@ BINARY := build/$(OSNAME).bin CC := sdcc -CFLAGS := -mz80 --no-std-crt0 crt0.rel \ +CFLAGS := -mz80 \ -I kernel/include -I libc/include -DDEBUG -LDFLAGS := --code-loc 0x0800 --data-loc 0x8000 +LDFLAGS := -mz80 --no-std-crt0 crt0.rel \ + --code-loc 0x0800 --data-loc 0x8000 +.PHONY: dirs dis clean all: $(BINARY) # build binary -$(BINARY): $(CSOURCES) crt0.rel - mkdir -p build - $(CC) $(CFLAGS) $(LDFLSGS) $(CSOURCES) -o $(HEXFILE) +$(BINARY): $(OBJECTS) dirs + $(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE) xxd -r -p $(HEXFILE) $(BINARY) +$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs crt0.rel + $(CC) $(CFLAGS) -c $< -o $@ + crt0.rel: crt0.s sdasz80 -o $< +dirs: + mkdir -p build build/kernel build/libc + dis: $(BINARY) z80dasm -a -g 0h $< -o $(OSNAME).s clean: - - rm build/* + - rm -rd build/* - rm $(OSNAME).s - rm crt0.rel |